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Help with String based program!!!

The Question is:
Write a program to input a string and print the frequency of each character.
Example:
INPUT: COMPUTER HARDWARE
OUTPUT: CHARACTERS FREQUENCY
A 2
C 1
AND SO ON...
The source code i wrote was:

The correction was at line # itself.
I neede to write a.chatAt(k-1).
It was because when a loop executes, then the iteration is executed, so at that time 'k' was 9, which did not exist.
Thats all folks!!!